<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button id="btn">显示/隐藏</button>
    <div id="box">hello jack</div>
    <script>
        const btn = document.getElementById('btn');
        const box = document.getElementById('box');

        btn.onclick = function () {
            box.hidden = !box.hidden;
        }

    </script>
</body>

</html>